2 * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
12 #include "internal/numbers.h"
13 #include <openssl/x509v3.h>
14 #include <openssl/x509_vfy.h>
15 #include "crypto/x509.h"
16 #include "internal/tsan_assist.h"
18 static int check_ssl_ca(const X509 *x);
19 static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
21 static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
23 static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
25 static int purpose_smime(const X509 *x, int ca);
26 static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
28 static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
30 static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
32 static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
34 static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);
35 static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca);
37 static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b);
38 static void xptable_free(X509_PURPOSE *p);
40 static X509_PURPOSE xstandard[] = {
41 {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0,
42 check_purpose_ssl_client, "SSL client", "sslclient", NULL},
43 {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
44 check_purpose_ssl_server, "SSL server", "sslserver", NULL},
45 {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
46 check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
47 {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign,
48 "S/MIME signing", "smimesign", NULL},
49 {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0,
50 check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
51 {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign,
52 "CRL signing", "crlsign", NULL},
53 {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any",
55 {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper,
56 "OCSP helper", "ocsphelper", NULL},
57 {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0,
58 check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign",
62 #define X509_PURPOSE_COUNT OSSL_NELEM(xstandard)
64 static STACK_OF(X509_PURPOSE) *xptable = NULL;
66 static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b)
68 return (*a)->purpose - (*b)->purpose;
72 * As much as I'd like to make X509_check_purpose use a "const" X509* I
73 * really can't because it does recalculate hashes and do other non-const
76 int X509_check_purpose(X509 *x, int id, int ca)
79 const X509_PURPOSE *pt;
81 if (!X509v3_cache_extensions(x, NULL, NULL))
84 /* Return if side-effect only call */
87 idx = X509_PURPOSE_get_by_id(id);
90 pt = X509_PURPOSE_get0(idx);
91 return pt->check_purpose(pt, x, ca);
94 int X509_PURPOSE_set(int *p, int purpose)
96 if (X509_PURPOSE_get_by_id(purpose) == -1) {
97 X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE);
104 int X509_PURPOSE_get_count(void)
107 return X509_PURPOSE_COUNT;
108 return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT;
111 X509_PURPOSE *X509_PURPOSE_get0(int idx)
115 if (idx < (int)X509_PURPOSE_COUNT)
116 return xstandard + idx;
117 return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
120 int X509_PURPOSE_get_by_sname(const char *sname)
124 for (i = 0; i < X509_PURPOSE_get_count(); i++) {
125 xptmp = X509_PURPOSE_get0(i);
126 if (strcmp(xptmp->sname, sname) == 0)
132 int X509_PURPOSE_get_by_id(int purpose)
137 if ((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX))
138 return purpose - X509_PURPOSE_MIN;
141 tmp.purpose = purpose;
142 idx = sk_X509_PURPOSE_find(xptable, &tmp);
145 return idx + X509_PURPOSE_COUNT;
148 int X509_PURPOSE_add(int id, int trust, int flags,
149 int (*ck) (const X509_PURPOSE *, const X509 *, int),
150 const char *name, const char *sname, void *arg)
155 * This is set according to what we change: application can't set it
157 flags &= ~X509_PURPOSE_DYNAMIC;
158 /* This will always be set for application modified trust entries */
159 flags |= X509_PURPOSE_DYNAMIC_NAME;
160 /* Get existing entry if any */
161 idx = X509_PURPOSE_get_by_id(id);
162 /* Need a new entry */
164 if ((ptmp = OPENSSL_malloc(sizeof(*ptmp))) == NULL) {
165 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
168 ptmp->flags = X509_PURPOSE_DYNAMIC;
170 ptmp = X509_PURPOSE_get0(idx);
172 /* OPENSSL_free existing name if dynamic */
173 if (ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) {
174 OPENSSL_free(ptmp->name);
175 OPENSSL_free(ptmp->sname);
177 /* dup supplied name */
178 ptmp->name = OPENSSL_strdup(name);
179 ptmp->sname = OPENSSL_strdup(sname);
180 if (ptmp->name == NULL|| ptmp->sname == NULL) {
181 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
184 /* Keep the dynamic flag of existing entry */
185 ptmp->flags &= X509_PURPOSE_DYNAMIC;
186 /* Set all other flags */
187 ptmp->flags |= flags;
191 ptmp->check_purpose = ck;
192 ptmp->usr_data = arg;
194 /* If its a new entry manage the dynamic table */
197 && (xptable = sk_X509_PURPOSE_new(xp_cmp)) == NULL) {
198 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
201 if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
202 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
209 OPENSSL_free(ptmp->name);
210 OPENSSL_free(ptmp->sname);
216 static void xptable_free(X509_PURPOSE *p)
220 if (p->flags & X509_PURPOSE_DYNAMIC) {
221 if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
222 OPENSSL_free(p->name);
223 OPENSSL_free(p->sname);
229 void X509_PURPOSE_cleanup(void)
231 sk_X509_PURPOSE_pop_free(xptable, xptable_free);
235 int X509_PURPOSE_get_id(const X509_PURPOSE *xp)
240 char *X509_PURPOSE_get0_name(const X509_PURPOSE *xp)
245 char *X509_PURPOSE_get0_sname(const X509_PURPOSE *xp)
250 int X509_PURPOSE_get_trust(const X509_PURPOSE *xp)
255 static int nid_cmp(const int *a, const int *b)
260 DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid);
261 IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid);
263 int X509_supported_extension(X509_EXTENSION *ex)
266 * This table is a list of the NIDs of supported extensions: that is
267 * those which are used by the verify process. If an extension is
268 * critical and doesn't appear in this list then the verify process will
269 * normally reject the certificate. The list must be kept in numerical
270 * order because it will be searched using bsearch.
273 static const int supported_nids[] = {
274 NID_netscape_cert_type, /* 71 */
275 NID_key_usage, /* 83 */
276 NID_subject_alt_name, /* 85 */
277 NID_basic_constraints, /* 87 */
278 NID_certificate_policies, /* 89 */
279 NID_crl_distribution_points, /* 103 */
280 NID_ext_key_usage, /* 126 */
281 #ifndef OPENSSL_NO_RFC3779
282 NID_sbgp_ipAddrBlock, /* 290 */
283 NID_sbgp_autonomousSysNum, /* 291 */
285 NID_policy_constraints, /* 401 */
286 NID_proxyCertInfo, /* 663 */
287 NID_name_constraints, /* 666 */
288 NID_policy_mappings, /* 747 */
289 NID_inhibit_any_policy /* 748 */
292 int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
294 if (ex_nid == NID_undef)
297 if (OBJ_bsearch_nid(&ex_nid, supported_nids, OSSL_NELEM(supported_nids)))
302 static int setup_dp(X509 *x, DIST_POINT *dp)
304 const X509_NAME *iname = NULL;
308 if (dp->reasons->length > 0)
309 dp->dp_reasons = dp->reasons->data[0];
310 if (dp->reasons->length > 1)
311 dp->dp_reasons |= (dp->reasons->data[1] << 8);
312 dp->dp_reasons &= CRLDP_ALL_REASONS;
314 dp->dp_reasons = CRLDP_ALL_REASONS;
315 if (!dp->distpoint || (dp->distpoint->type != 1))
317 for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
318 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
319 if (gen->type == GEN_DIRNAME) {
320 iname = gen->d.directoryName;
325 iname = X509_get_issuer_name(x);
327 return DIST_POINT_set_dpname(dp->distpoint, iname);
330 static int setup_crldp(X509 *x)
334 x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, &i, NULL);
335 if (x->crldp == NULL && i != -1)
337 for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) {
338 if (!setup_dp(x, sk_DIST_POINT_value(x->crldp, i)))
344 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
345 #define ku_reject(x, usage) \
346 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
347 #define xku_reject(x, usage) \
348 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
349 #define ns_reject(x, usage) \
350 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
352 int X509v3_cache_extensions(X509 *x, OPENSSL_CTX *libctx, const char *propq)
354 BASIC_CONSTRAINTS *bs;
355 PROXY_CERT_INFO_EXTENSION *pci;
356 ASN1_BIT_STRING *usage;
358 EXTENDED_KEY_USAGE *extusage;
364 /* fast lock-free check, see end of the function for details. */
365 if (tsan_ld_acq((TSAN_QUALIFIER int *)&x->ex_cached))
366 return (x->ex_flags & EXFLAG_INVALID) == 0;
369 CRYPTO_THREAD_write_lock(x->lock);
370 if (x->ex_flags & EXFLAG_SET) {
371 CRYPTO_THREAD_unlock(x->lock);
372 return (x->ex_flags & EXFLAG_INVALID) == 0;
375 sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
376 if (sha1 == NULL || !X509_digest(x, sha1, x->sha1_hash, NULL))
377 x->ex_flags |= EXFLAG_INVALID;
380 /* V1 should mean no extensions ... */
381 if (!X509_get_version(x))
382 x->ex_flags |= EXFLAG_V1;
383 /* Handle basic constraints */
384 if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, &i, NULL))) {
386 x->ex_flags |= EXFLAG_CA;
388 if (bs->pathlen->type == V_ASN1_NEG_INTEGER) {
389 x->ex_flags |= EXFLAG_INVALID;
392 x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
393 if (!bs->ca && x->ex_pathlen != 0) {
394 x->ex_flags |= EXFLAG_INVALID;
400 BASIC_CONSTRAINTS_free(bs);
401 x->ex_flags |= EXFLAG_BCONS;
402 } else if (i != -1) {
403 x->ex_flags |= EXFLAG_INVALID;
405 /* Handle proxy certificates */
406 if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, &i, NULL))) {
407 if (x->ex_flags & EXFLAG_CA
408 || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0
409 || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) {
410 x->ex_flags |= EXFLAG_INVALID;
412 if (pci->pcPathLengthConstraint) {
413 x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint);
415 x->ex_pcpathlen = -1;
416 PROXY_CERT_INFO_EXTENSION_free(pci);
417 x->ex_flags |= EXFLAG_PROXY;
418 } else if (i != -1) {
419 x->ex_flags |= EXFLAG_INVALID;
421 /* Handle key usage */
422 if ((usage = X509_get_ext_d2i(x, NID_key_usage, &i, NULL))) {
423 if (usage->length > 0) {
424 x->ex_kusage = usage->data[0];
425 if (usage->length > 1)
426 x->ex_kusage |= usage->data[1] << 8;
429 x->ex_flags |= EXFLAG_KUSAGE;
430 ASN1_BIT_STRING_free(usage);
431 } else if (i != -1) {
432 x->ex_flags |= EXFLAG_INVALID;
435 if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, &i, NULL))) {
436 x->ex_flags |= EXFLAG_XKUSAGE;
437 for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
438 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) {
439 case NID_server_auth:
440 x->ex_xkusage |= XKU_SSL_SERVER;
443 case NID_client_auth:
444 x->ex_xkusage |= XKU_SSL_CLIENT;
447 case NID_email_protect:
448 x->ex_xkusage |= XKU_SMIME;
452 x->ex_xkusage |= XKU_CODE_SIGN;
457 x->ex_xkusage |= XKU_SGC;
461 x->ex_xkusage |= XKU_OCSP_SIGN;
465 x->ex_xkusage |= XKU_TIMESTAMP;
469 x->ex_xkusage |= XKU_DVCS;
472 case NID_anyExtendedKeyUsage:
473 x->ex_xkusage |= XKU_ANYEKU;
477 sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
478 } else if (i != -1) {
479 x->ex_flags |= EXFLAG_INVALID;
482 if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, &i, NULL))) {
484 x->ex_nscert = ns->data[0];
487 x->ex_flags |= EXFLAG_NSCERT;
488 ASN1_BIT_STRING_free(ns);
489 } else if (i != -1) {
490 x->ex_flags |= EXFLAG_INVALID;
492 x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, &i, NULL);
493 if (x->skid == NULL && i != -1)
494 x->ex_flags |= EXFLAG_INVALID;
495 x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, &i, NULL);
496 if (x->akid == NULL && i != -1)
497 x->ex_flags |= EXFLAG_INVALID;
498 /* Does subject name match issuer ? */
499 if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) {
500 x->ex_flags |= EXFLAG_SI;
501 /* If SKID matches AKID also indicate self signed */
502 if (X509_check_akid(x, x->akid) == X509_V_OK &&
503 !ku_reject(x, KU_KEY_CERT_SIGN))
504 x->ex_flags |= EXFLAG_SS;
506 x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, &i, NULL);
507 if (x->altname == NULL && i != -1)
508 x->ex_flags |= EXFLAG_INVALID;
509 x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
510 if (x->nc == NULL && i != -1)
511 x->ex_flags |= EXFLAG_INVALID;
513 x->ex_flags |= EXFLAG_INVALID;
515 #ifndef OPENSSL_NO_RFC3779
516 x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, &i, NULL);
517 if (x->rfc3779_addr == NULL && i != -1)
518 x->ex_flags |= EXFLAG_INVALID;
519 x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum, &i, NULL);
520 if (x->rfc3779_asid == NULL && i != -1)
521 x->ex_flags |= EXFLAG_INVALID;
523 for (i = 0; i < X509_get_ext_count(x); i++) {
524 ex = X509_get_ext(x, i);
525 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
527 x->ex_flags |= EXFLAG_FRESHEST;
528 if (!X509_EXTENSION_get_critical(ex))
530 if (!X509_supported_extension(ex)) {
531 x->ex_flags |= EXFLAG_CRITICAL;
535 x509_init_sig_info(x);
536 x->ex_flags |= EXFLAG_SET;
538 tsan_st_rel((TSAN_QUALIFIER int *)&x->ex_cached, 1);
540 * Above store triggers fast lock-free check in the beginning of the
541 * function. But one has to ensure that the structure is "stable", i.e.
542 * all stores are visible on all processors. Hence the release fence.
545 CRYPTO_THREAD_unlock(x->lock);
547 return (x->ex_flags & EXFLAG_INVALID) == 0;
551 * CA checks common to all purposes
555 * 2 basicConstraints absent so "maybe" a CA
556 * 3 basicConstraints absent but self signed V1.
557 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
560 static int check_ca(const X509 *x)
562 /* keyUsage if present should allow cert signing */
563 if (ku_reject(x, KU_KEY_CERT_SIGN))
565 if (x->ex_flags & EXFLAG_BCONS) {
566 if (x->ex_flags & EXFLAG_CA)
568 /* If basicConstraints says not a CA then say so */
572 /* we support V1 roots for... uh, I don't really know why. */
573 if ((x->ex_flags & V1_ROOT) == V1_ROOT)
576 * If key usage present it must have certSign so tolerate it
578 else if (x->ex_flags & EXFLAG_KUSAGE)
580 /* Older certificates could have Netscape-specific CA types */
581 else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA)
583 /* can this still be regarded a CA certificate? I doubt it */
588 void X509_set_proxy_flag(X509 *x)
590 x->ex_flags |= EXFLAG_PROXY;
593 void X509_set_proxy_pathlen(X509 *x, long l)
598 int X509_check_ca(X509 *x)
600 /* Note 0 normally means "not a CA" - but in this case means error. */
601 if (!X509v3_cache_extensions(x, NULL, NULL))
607 /* Check SSL CA: common checks for SSL client and server */
608 static int check_ssl_ca(const X509 *x)
611 ca_ret = check_ca(x);
614 /* check nsCertType if present */
615 if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA)
621 static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
624 if (xku_reject(x, XKU_SSL_CLIENT))
627 return check_ssl_ca(x);
628 /* We need to do digital signatures or key agreement */
629 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT))
631 /* nsCertType if present should allow SSL client use */
632 if (ns_reject(x, NS_SSL_CLIENT))
638 * Key usage needed for TLS/SSL server: digital signature, encipherment or
639 * key agreement. The ssl code can check this more thoroughly for individual
643 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
645 static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
648 if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC))
651 return check_ssl_ca(x);
653 if (ns_reject(x, NS_SSL_SERVER))
655 if (ku_reject(x, KU_TLS))
662 static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
666 ret = check_purpose_ssl_server(xp, x, ca);
669 /* We need to encipher or Netscape complains */
670 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
675 /* common S/MIME checks */
676 static int purpose_smime(const X509 *x, int ca)
678 if (xku_reject(x, XKU_SMIME))
682 ca_ret = check_ca(x);
685 /* check nsCertType if present */
686 if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA)
691 if (x->ex_flags & EXFLAG_NSCERT) {
692 if (x->ex_nscert & NS_SMIME)
694 /* Workaround for some buggy certificates */
695 if (x->ex_nscert & NS_SSL_CLIENT)
702 static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
706 ret = purpose_smime(x, ca);
709 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION))
714 static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
718 ret = purpose_smime(x, ca);
721 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
726 static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
731 if ((ca_ret = check_ca(x)) != 2)
736 if (ku_reject(x, KU_CRL_SIGN))
742 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
743 * is valid. Additional checks must be made on the chain.
746 static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
749 * Must be a valid CA. Should we really support the "I don't know" value
754 /* leaf certificate is checked in OCSP_verify() */
758 static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
763 /* If ca is true we must return if this is a valid CA certificate. */
768 * Check the optional key usage field:
769 * if Key Usage is present, it must be one of digitalSignature
770 * and/or nonRepudiation (other values are not consistent and shall
773 if ((x->ex_flags & EXFLAG_KUSAGE)
774 && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
775 !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
778 /* Only time stamp key usage is permitted and it's required. */
779 if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
782 /* Extended Key Usage MUST be critical */
783 i_ext = X509_get_ext_by_NID(x, NID_ext_key_usage, -1);
785 X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext);
786 if (!X509_EXTENSION_get_critical(ext))
793 static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
799 * Various checks to see if one certificate issued the second.
800 * This can be used to prune a set of possible issuer certificates
801 * which have been looked up using some simple method such as by
804 * 1. Check issuer_name(subject) == subject_name(issuer)
805 * 2. If akid(subject) exists, check that it matches issuer
806 * 3. Check that issuer public key algorithm matches subject signature algorithm
807 * 4. If key_usage(issuer) exists, check that it supports certificate signing
808 * returns 0 for OK, positive for reason for mismatch, reasons match
809 * codes for X509_verify_cert()
812 int X509_check_issued(X509 *issuer, X509 *subject)
814 if (X509_NAME_cmp(X509_get_subject_name(issuer),
815 X509_get_issuer_name(subject)))
816 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
818 if (!X509v3_cache_extensions(issuer, NULL, NULL)
819 || !X509v3_cache_extensions(subject, NULL, NULL))
820 return X509_V_ERR_UNSPECIFIED;
823 int ret = X509_check_akid(issuer, subject->akid);
824 if (ret != X509_V_OK)
830 * Check if the subject signature algorithm matches the issuer's PUBKEY
833 EVP_PKEY *i_pkey = X509_get0_pubkey(issuer);
834 X509_ALGOR *s_algor = &subject->cert_info.signature;
835 int s_pknid = NID_undef, s_mdnid = NID_undef;
838 return X509_V_ERR_NO_ISSUER_PUBLIC_KEY;
840 if (!OBJ_find_sigid_algs(OBJ_obj2nid(s_algor->algorithm),
842 || EVP_PKEY_type(s_pknid) != EVP_PKEY_base_id(i_pkey))
843 return X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH;
846 if (subject->ex_flags & EXFLAG_PROXY) {
847 if (ku_reject(issuer, KU_DIGITAL_SIGNATURE))
848 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
849 } else if (ku_reject(issuer, KU_KEY_CERT_SIGN))
850 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
854 int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
860 /* Check key ids (if present) */
861 if (akid->keyid && issuer->skid &&
862 ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid))
863 return X509_V_ERR_AKID_SKID_MISMATCH;
864 /* Check serial number */
866 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
867 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
868 /* Check issuer name */
871 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
872 * GeneralName. So look for a DirName. There may be more than one but
873 * we only take any notice of the first.
877 X509_NAME *nm = NULL;
880 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
881 gen = sk_GENERAL_NAME_value(gens, i);
882 if (gen->type == GEN_DIRNAME) {
887 if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
888 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
893 uint32_t X509_get_extension_flags(X509 *x)
895 /* Call for side-effect of computing hash and caching extensions */
896 X509_check_purpose(x, -1, -1);
900 uint32_t X509_get_key_usage(X509 *x)
902 /* Call for side-effect of computing hash and caching extensions */
903 if (X509_check_purpose(x, -1, -1) != 1)
905 if (x->ex_flags & EXFLAG_KUSAGE)
910 uint32_t X509_get_extended_key_usage(X509 *x)
912 /* Call for side-effect of computing hash and caching extensions */
913 if (X509_check_purpose(x, -1, -1) != 1)
915 if (x->ex_flags & EXFLAG_XKUSAGE)
916 return x->ex_xkusage;
920 const ASN1_OCTET_STRING *X509_get0_subject_key_id(X509 *x)
922 /* Call for side-effect of computing hash and caching extensions */
923 if (X509_check_purpose(x, -1, -1) != 1)
928 const ASN1_OCTET_STRING *X509_get0_authority_key_id(X509 *x)
930 /* Call for side-effect of computing hash and caching extensions */
931 if (X509_check_purpose(x, -1, -1) != 1)
933 return (x->akid != NULL ? x->akid->keyid : NULL);
936 const GENERAL_NAMES *X509_get0_authority_issuer(X509 *x)
938 /* Call for side-effect of computing hash and caching extensions */
939 if (X509_check_purpose(x, -1, -1) != 1)
941 return (x->akid != NULL ? x->akid->issuer : NULL);
944 const ASN1_INTEGER *X509_get0_authority_serial(X509 *x)
946 /* Call for side-effect of computing hash and caching extensions */
947 if (X509_check_purpose(x, -1, -1) != 1)
949 return (x->akid != NULL ? x->akid->serial : NULL);
952 long X509_get_pathlen(X509 *x)
954 /* Called for side effect of caching extensions */
955 if (X509_check_purpose(x, -1, -1) != 1
956 || (x->ex_flags & EXFLAG_BCONS) == 0)
958 return x->ex_pathlen;
961 long X509_get_proxy_pathlen(X509 *x)
963 /* Called for side effect of caching extensions */
964 if (X509_check_purpose(x, -1, -1) != 1
965 || (x->ex_flags & EXFLAG_PROXY) == 0)
967 return x->ex_pcpathlen;